diff --git a/.github/workflows/deploy-pr.yaml b/.github/workflows/deploy-pr.yaml
index 9a311a2..c59f484 100644
--- a/.github/workflows/deploy-pr.yaml
+++ b/.github/workflows/deploy-pr.yaml
@@ -109,7 +109,7 @@ jobs:
             const prNumber = pr.number;
             const backendUrl = process.env.BACKEND_URL || '(not available)';
             const frontendUrl = process.env.FRONTEND_URL || '(not available)';
-            const marker = '';
+            const marker = '<!-- preview-comment-marker -->';
             const body = `${marker}\nPreview environment is running\n- Frontend: ${frontendUrl}\n- Backend: ${backendUrl}\n`;
             const { owner, repo } = context.repo;
             const { data: comments } = await github.rest.issues.listComments({ owner, repo, issue_number: prNumber, per_page: 100 });